Figure 1

Dose response association between current symptom load of anxiety and depression (GHQ-12), and percent reporting IBS (tests for trend p < .001). Dose response association for whole range (p < .001), and also excluding the two last centiles of the GHQ distribution (p = .040 and p = .008 for current and lifetime respectively). The apparent curve-linearity in the GHQ IBS association was statistically significant (p = .021 and p = .019 for current and lifetime respectively).